Hazardous Seas Watch 9, NWS Eureka, CA

550 
WHUS76 KEKA 240344
MWWEKA

URGENT - MARINE WEATHER MESSAGE
National Weather Service Eureka CA
844 PM PDT Fri Jul 23 2021

PZZ470-241145-
/O.CON.KEKA.SC.Y.0076.000000T0000Z-210725T0100Z/
/O.CON.KEKA.SE.A.0009.210725T0100Z-210726T1900Z/
Pt St George to Cape Mendocino 10 to 60 nm-
844 PM PDT Fri Jul 23 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 6 PM PDT
SATURDAY...
...HAZARDOUS SEAS WATCH REMAINS IN EFFECT FROM SATURDAY EVENING
THROUGH MONDAY MORNING...

* WHAT...For the Small Craft Advisory, north winds 20 to 30 kt 
  with gusts up to 35 kt and seas 7 to 11 feet. For the 
  Hazardous Seas Watch, very steep and hazardous seas 9 to 13 
  feet possible.

* WHERE...Pt St George to Cape Mendocino 10 to 60 nm.

* WHEN...For the Small Craft Advisory, until 6 PM PDT Saturday. 
  For the Hazardous Seas Watch, from Saturday evening through 
  Monday morning.

* IMPACTS...Very steep and hazardous seas could capsize or cause 
  damage to vessels.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Consider altering your plans to avoid possible hazardous sea
conditions.

&&

$$

PZZ450-241000-
/O.CON.KEKA.SC.Y.0076.000000T0000Z-210724T1000Z/
Pt St George to Cape Mendocino out 10 nm-
844 PM PDT Fri Jul 23 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 3 AM PDT
SATURDAY...

* WHAT...Seas 5 to 8 feet.

* WHERE...Pt St George to Cape Mendocino out 10 nm.

* WHEN...Until 3 AM PDT Saturday.

* IMPACTS...Conditions will be hazardous to small crafts.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

PZZ455-241000-
/O.CON.KEKA.SC.Y.0074.000000T0000Z-210724T1000Z/
Cape Mendocino to Pt Arena out 10 nm-
844 PM PDT Fri Jul 23 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 3 AM PDT
SATURDAY...

* WHAT...Northwest winds 10 to 20 kt with gusts up to 25 kt and 
  seas 4 to 8 feet.

* WHERE...Cape Mendocino to Pt Arena out 10 nm.

* WHEN...Until 3 AM PDT Saturday.

* IMPACTS...Conditions will be hazardous to small crafts.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

PZZ475-241145-
/O.CON.KEKA.SC.Y.0074.000000T0000Z-210726T2200Z/
Cape Mendocino to Pt Arena 10 to 60 nm-
844 PM PDT Fri Jul 23 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 3 PM PDT MONDAY...

* WHAT...North winds 15 to 25 kt with gusts up to 30 kt and seas 
  7 to 12 feet.

* WHERE...Cape Mendocino to Pt Arena 10 to 60 nm.

* WHEN...Until 3 PM PDT Monday.

* IMPACTS...Conditions will be hazardous to small crafts.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

534 
WHUS76 KEKA 240940
MWWEKA

URGENT - MARINE WEATHER MESSAGE
National Weather Service Eureka CA
240 AM PDT Sat Jul 24 2021

PZZ450-241045-
/O.CAN.KEKA.SC.Y.0076.000000T0000Z-210724T1000Z/
Pt St George to Cape Mendocino out 10 nm-
240 AM PDT Sat Jul 24 2021

...SMALL CRAFT ADVISORY IS CANCELLED...

$$

PZZ455-241045-
/O.CAN.KEKA.SC.Y.0074.000000T0000Z-210724T1000Z/
Cape Mendocino to Pt Arena out 10 nm-
240 AM PDT Sat Jul 24 2021

...SMALL CRAFT ADVISORY IS CANCELLED...

$$

PZZ470-241745-
/O.CON.KEKA.SC.Y.0076.000000T0000Z-210725T0100Z/
/O.UPG.KEKA.SE.A.0009.210725T0100Z-210726T1900Z/
/O.NEW.KEKA.SE.W.0042.210725T0100Z-210726T1000Z/
Pt St George to Cape Mendocino 10 to 60 nm-
240 AM PDT Sat Jul 24 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 6 PM PDT THIS
EVENING...
...HAZARDOUS SEAS WARNING IN EFFECT FROM 6 PM THIS EVENING TO
3 AM PDT MONDAY...

* WHAT...For the Hazardous Seas Warning, very steep and 
  hazardous seas 9 to 12 feet expected. For the Small Craft 
  Advisory, north winds 20 to 30 kt with gusts up to 35 kt and 
  seas 8 to 10 feet.

* WHERE...Pt St George to Cape Mendocino 10 to 60 nm.

* WHEN...For the Hazardous Seas Warning, from 6 PM this evening 
  to 3 AM PDT Monday. For the Small Craft Advisory, until 6 PM 
  PDT this evening.

* IMPACTS...Very steep and hazardous seas could capsize or cause 
  damage to vessels.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Recreational boaters should remain in port. Commercial vessels
should prepare for rough seas and consider remaining in port
until hazardous seas subside.

&&

$$

PZZ475-241745-
/O.CON.KEKA.SC.Y.0074.000000T0000Z-210726T2200Z/
Cape Mendocino to Pt Arena 10 to 60 nm-
240 AM PDT Sat Jul 24 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 3 PM PDT MONDAY...

* WHAT...North winds 15 to 25 kt with gusts up to 30 kt and seas 
  7 to 12 feet.

* WHERE...Cape Mendocino to Pt Arena 10 to 60 nm.

* WHEN...Until 3 PM PDT Monday.

* IMPACTS...Conditions will be hazardous to small crafts.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

AREA FORECAST DISCUSSION National Weather Service Eureka CA 441 AM
PDT Fri Jul 23 2021

.SYNOPSIS...Temperatures will warm into the 90s to low 100s this
weekend. In addition, periods of sunshine and mild afternoon
conditions are expected along the coast. Otherwise, showers and
thunderstorms will be possible next week as monsoon moisture spreads
north across the region.

&&

.DISCUSSION...Quasi-zonal flow aloft is underway today with patches
of stratus along the coast, and some streaks of high clouds pulling
in from the southwest. 500mb heights tick up slightly through the
weekend. A warming trend will subsequently occur over NWRN CA, with
interior valley highs expected to range from the 90s to low 100s.

Otherwise, model guidance continues to show an anomalous plume of
monsoon moisture spreading west and north around an anticyclone
located over the Intermountain West. That moisture is forecast to
move across NWRN CA Sunday night into Monday, and then linger
through mid week. The moisture will initially be moving into a
stable well-capped environment on Monday, but terrain driven,
elevated isolated dry thunderstorms that can penetrate the cap will
be possible in the heat of the day. Models will struggle in
resolving these types of storms. In addition, a PV anomaly is
forecast to move north across the region as early as Tuesday, with
models diverging on the timing and structure. Ascent occurring
downstream from the feature combined with a moist and weak to
moderately unstable airmass will likely yield shower and
thunderstorm development. An upper low may then work its way into
the area from the south late next weak. Given the rarity of this
setup, and still much uncertainty in the finer details, well be
holding out in inserting thunder into the forecast at this time.

&&

.AVIATION...This morning's stratus has again redeveloped as expected
with coverage extending from near the OR border to Cape Mendocino.
The marine layer is about the same depth as yesterday at this time
however there is less inland coverage. The thickest clouds are from
Cape Mendocino to around the Humboldt Bay area, with some patches
along the coast north toward Crescent City. Conditions at KUKI are
expected to remain VFR. Winds will be generally light, with
afternoon and evening gusts at KCEC. /MKN

&&

.MARINE...Northerly winds are expected to continue through the
period, with occasional gusts to gale force across portions of the
outer waters. The latest forecast package continues to not support
Gale Warnings or Hazardous Seas Warnings, so will stick with the
strongly worded Small Craft Advisories. The Local gale force gusts
will be downwind from mainly Pt St George, but areal coverage within
each zone will be much less than 50%. A NW swell and a long period
SSW swell will return to the waters late in the weekend, but both of
these swell trains are expected to be fairly small, and the forecast
will be dominated by the short period, locally generated waves.
/MKN

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...None.
NORTHWEST CALIFORNIA COASTAL WATERS...Small Craft Advisory until 3
AM PDT Saturday for PZZ450-455.

     Small Craft Advisory until 3 PM PDT Monday for PZZ470-475.

&&

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For forecast zone information
see the forecast zone map online:
https://www.weather.gov/images/eka/zonemap.png

Hazardous Weather Outlook
National Weather Service Eureka CA
203 PM PDT Fri Jul 23 2021

CAZ102-105>115-242115-
Del Norte Interior-Northern Humboldt Interior-
Southern Humboldt Interior-Northern Trinity-Southern Trinity-
Mendocino Coast-Northwestern Mendocino Interior-
Northeastern Mendocino Interior-Southwestern Mendocino Interior-
Southeastern Mendocino Interior-Northern Lake-Southern Lake-
203 PM PDT Fri Jul 23 2021

...FIRE WEATHER WATCH IN EFFECT FROM LATE SUNDAY NIGHT THROUGH
MONDAY EVENING...

This hazardous weather outlook is for northwest California.

.DAY ONE...This afternoon and tonight.

No hazardous weather is expected.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

A Fire Weather Watch is currently in effect Monday. A slight chance
of thunderstorms exists Monday and Tuesday.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.

CAZ101-103-104-242115-
Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt-
203 PM PDT Fri Jul 23 2021

This hazardous weather outlook is for northwest California.

.DAY ONE...This afternoon and tonight.

No hazardous weather is expected.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

A slight chance of thunderstorms exists Monday and Tuesday.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.